Refactored to remove deprecated set-env
Refactored to remove deprecated set-env

set-env is now deprecated, this commit fixes the action by using set-output instead.

More here:
https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
psanders/sipio,fonoster/sipio,fonoster/sipio,psanders/sipio,fonoster/sipio